InChI=1S/C27H22O12/c28-17-5-2-15(9-20(17)31)12-23(26(34)35)38-22-11-14(1-7-19(22)30)4-8-25(33)39-24(27(36)37)13-16-3-6-18(29)21(32)10-16/h1-12,24,28-32H,13H2,(H,34,35)(H,36,37)/b8-4+,23-12-